When you start a new game in SimCity 2000 (you can try it in the browser yourself), as the city is generated, you see a few messages fly by: Creating Hills, Tracing Rivers, Smoothing. Among them, for a bit, one can see “Reticulating Splines”:

If it was not obvious from seeing Smoothing followed by More Smoothing and then Yet More Smoothing, the phrase is a joke. From The Official SimCity 2000 Planning Commission Handbook:

“Reticulating splines” is a giant pulling of our legs. Will and some others made up the phrase because they thought it looks and sounds as if it means something. It might: the word “reticulate” means to divide something so that it looks like, or appears to be, a net or a network generating, perhaps, from a single point; a “spline” can be an irregular curve or the approximation of a curve. Individually the terms have meaning. Together – in the case of SimCity 2000 – they don’t. It’s just a prank and a joke.

In some versions of the game, there was also a seductive woman’s voice saying the phrase out loud, which presumably made it even more memorable.

The phrase moved to other Maxis games, notably The Sims…

…and subsequently Minecraft…

…and then tons of other places.

I’ve heard the argument that it wasn’t just Reticulating Splines – that Will Wright’s joke was the beginning of the habit of putting “cute” loading messages in apps, including actual not-game and definitely-not-cute applications. I am 100% sure there are some earlier examples of “funny” loading or error states, but I also see how this one attained a certain critical mass and influence.

I hate these cute loading strings with passion. I think I’m in the minority. It’s a topic for a future time, but it was fun at least to trace some part of its history, sifting through hundreds of pages earnestly explaining the concept of “reticulating splines” to people. Whether they’re in on the joke, I am not sure.

Also, okay. Fair enough. I chuckled just now when I saw this: